Apple has released a software update for AirTags following concerns they could be used to track people secretly.
What's an AirTag?
The AirTag works similarly to the Tile tag in that you can clip one of the small devices onto keys, a bag or whatever using a separate keychain. The tag can be used without the keychain as well and slipped into a wallet or bag. The AirTag can be paired with items like your iPhone, and it works with the Find My app.
The AirTag is a small, lightweight, stainless steel disc with the Apple logo on one side. You can personalize the other side with a free engraving. The new device is also water and dust resistant, with a removable cover designed to make it easy to change the CR2032 battery, which promises a year's worth of battery life with everyday use.
AirTags were released in April and were promoted as a way for people to keep track of their belongings.
However, critics warned that the coin-sized tracker could be easily used to monitor someone's real-time location.
Following the update, AirTags will beep if they are away from their owner's iPhone - at a random time between eight and 24 hours - to alert people nearby.
AirTags should update their software automatically when they are close to the owner's iPhone.
When it announced AirTags in April, Apple said it had designed features to prevent them being used to stalk people.
The device is small enough to be placed inside a bag or a coat pocket, which raised concerns about its potential for misuse.
If an iPhone detects that somebody else's tracker is following it around, it is supposed to display an alert. The tags were also programmed to beep if they were away from their owner's iPhone for three days, potentially allowing the owner to be tracked without their knowledge.
People with Android smartphones do not see an on-screen warning.
Several reviewers said they had used AirTags to successfully track friends or family.
Kirk McElhearn wrote on tech blog Intego that he had posted one of the trackers to a friend in south London.
After the device was delivered, the friend left the envelope on his kitchen counter.
Mr McElhearn said his AirTag failed to alert his friend of its presence after more than four days in his house.
Some reviewers have also suggested the 15-second warning beeps are not loud enough to be heard over everyday household noises.
Following the update, an AirTag will beep at a random time between eight and 24 hours if it is away from its owner's iPhone.
Apple says it is also planning to introduce safeguards for Android users.
"Later this year, we will also introduce an Android application that will enable users to detect an AirTag or Find My network-enabled accessory separated from its owner that may be travelling with a user," said the company in a statement.
How much do AirTags cost and where can I buy one?
AirTags are now available to purchase for $29 per tag, or $99 for a four-pack (£29 or £99 in the UK, and AU$45 or AU$149 in Australia). You can buy them from Apple, Amazon or Best Buy. And though it's not required, you can more easily attach AirTags to your items with the keychain accessory, including one from Hermès. Here's what Apple is offering:
AirTag leather key ring for $35 in Baltic blue, saddle brown, Product Red.
AirTag leather loop for $39 in saddle brown and Product Red.
AirTag polyurethane loop for $29 in electric orange, sunflower, deep navy and white.
Belkin Secure Holder with strap for $13 in white, black, blue and pink.
Belkin Secure Holder with key ring for $13 in white, black, blue and pink.
In addition, Apple and Hermès created AirTag Hermès, which features a line of handcrafted leather bag charms, key rings and travel and luggage tags:
AirTag Hermès key ring starting at $349 in orange, bleu indigo and fauve.
AirTag Hermès bag charm starting at $299 in orange, bleu indigo and fauve.
AirTag Hermès luggage charm starting at $449 in fauve.